Police investigations into the killing of a chocolate Labrador found at Sulby Reservoir last month are continuing.

Initial examinations of the tape used to bind the dog have offered no new clues, but further tests are now being carried out.

Three photographs, including a new one of the dog's head, have been put on the appeals page of the Isle of Man Police website in the hope this could help identify the animal.

A substantial reward has been offered for information leading to the conviction of the person or persons responsible.

Anyone with information should contact Ramsey Police Station on 812234, Police Headquarters on 631212 or the anonymous Crimestoppers line.

The website address is www.gov.im/dha/police